Pneumatic hammer for rock-drills.



` No. 660,96l. y Patentewoct. 3o; moo. w. n. .longs & w. o.`P|Encl-:. PNEUMATIC HAMMER'FDB ROCK DRILLS.

(Application led July 2S, 1900.) No Model.)

UNITED STATES WILLIAM DAVID JONES AND WILLIAM OWEN PIERCE, OF PENMAEN-MAWR,

PATENT OFFICE.

ENGLAND, ASSIGNORS OF ONE-THIRD TO WILLIAM MAINE TREGLOWN,

OF LONDON, ENGLAND.

PNEUAMATIC HAMMER FOR ROCK-DRILLS.

SPECIFICATION formingpart of Letters Patent No. 660,961, dated October 30, 1900.

Application ledlJ'uly 23, 1900. Serial No.' 24,552. (No model.) Y

Rock-Drills and the Like, (for which application for patent has been made in Great Britain, No. 19,421, bearing date September 27, 1899,)

1o of which the following is a specification.

This invention relates to pneumatic hammers and other automatic percussive tools in which the cutting operationis eected by al succession of blows, and has for its object to [5 render such tools applicable for use as drills,

and more especially for use in drilling or boring rock and stone. In such pneumatic hammers and similar tools as usually employed the cutting-tool is loosely fitted at the end of zo a cylinder, within which a free piston slides, which upon the admission of fluid-pressure is forced against the head of the cutting-tool inwardly projecting within the cylinder, the piston being automatically retracted and again forced upon the inwardly-projecting head of the tool, thereby eecting a succession of blows upon the tool, wherebythe cutting or other operation is automatically effected. Y

The invention consists in providing means for the automatic rotation of the cutting-tool in such pneumatic hammers and similar automatic percussive tools, whereby a combined rotary and percussive action is automatically 3 5 given-to the cutting tool or bit, which is thereby rendered conveniently applicable for drilling or boring.

The means for rotating the tool are operated, preferably, by the exhaust from the cyl- 4o inder or direct from the power-supply, com,-

pressed air Abeing the motive power that is preferably employed.

The invention is illustrated in the accompanying drawings, in which- Figure 1 represents in partial longitudinal section an automatic hand hammer or drill in which the invention is embodied. Fig. 2 is an elevation corresponding thereto; and

Fig. 3 is a transverse vertical section on the line X Y, Fig'. 2.

The drawings represent one-convenient arrangement in which the invention can be carried into effect as applicable to a pneumatic hammer or tool.

In carrying the invention into eEect, as illustrated in the drawings, A is the cutting tool or bit, which is preferably secured to a shank B by means of a clamping-collar C, whereby various cutting-bits are capable of being employed. The shank B has a short and determined longitudinal movement, whereby the percussion of the sliding piston D may be taken up. -The shank B projects within the cylinder E'of the 'hammer or tool and slides within a sleeve F, provided in the extremity thereof. The shank B is preferably formed of square section at the part l), and a toothed sleeve or worm-wheel G is j mounted upon the shank at that part, so that the worm-wheel and shank rotate together.

A sleeve H is fixe'dly clamped in position to the end of the cylinder E by means of bolts J. This sleeve is provided with a transverse vboss h, within which is carried a spindle K -iiange B', providedupon the shank. A ring `n or other elastic element is provided between the ring N and the'cap M, so that the tool may rebound or jump ateach stroke of the piston on contact of the ange B with the ring N.

A casing O is fitted upon the sleeveY H and carries Within it the vane-wheels R, by means of which the rotation of the cutting-tool or of the shank B is effected. The casing O is screwed to the sleeve H by means of the screwed boss o, and the spindle K passes therethrough and carries the worm L before referred to, the opposite extremity of the spindle K being carried within a screwed sleeve Q, screwed within the lower part of the boss h.

One vane-wheel R is keyed to the spindle I( and gears with another secured upon the spindle K. A plate or cover S is secured to the casing, and the casing is fixedly mounted in position upon the sleeve by means of the pin o'. The compressed air or other motive fluid is led into the motor-casing O by the exible pipe 'I and passes out through a series oi' exhaust-ports upon the other side of the casing O.

The flexible pipe T is preferably connected with the exhaust-port of the cylinder E, or it may be secured to the main supply.

A relieivalve V may be provided for the purpose of arresting the rotation of the tool when required, or other means for the same purpose may be provided.

In the operation of the tool it will be understood that a continuous percussive action is given to the lshank B, which is in turn communicated to they tool. Meanwhile the shank and tool are caused to rotate to a degree dependent upon the ratio of the gearing employed and of the power-supply to the rotating device.

It will be of course understood that the invention is applicable to hammers or tools which are operated by steam, Water, or compressed air and that any other automatic means of rotating the cutting than those described may be employed-as, t'or example, a single vane-wheel, which may be either Xed onto the shank or cutting-too1 or which may communicate motion thereto through a worm and worin-wheel or other gear in the manner substantially as hereinbefore described.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is

I. In pneumatic hammers and other automatic percussive tools, means for effecting the rotation of the cutting-tool, consisting ot' a motor, a toothed wheel slida-bly and directly mounted upon the cutting-tool, and gear between the motor and the toothed wheel substantially as described.

2. In pneumatic hammers and other automatic percussive tools, means for effecting the rotation of the cutting-tool, consisting of a motor, a toothed wheel slidably mounted upon the cutting-tool, gear between the motor and the toothed wheel, a flange upon the cutting-tool, and an elastic ring with which the said tiange contacts on each stroke of the piston, for the purposes and substantially as described.`

3. In pneumatic hammers and other autom attic percussive tools, a sleeve secured to the extremity ot' the cylinder and held from rotary movement therewith, a motor mounted upon said sleeve, a toothed wheel within the sleeve slidably and directly mounted upon the cut-ting tool, and gear between said toothed wheel and motor, substantially as described.

4:. In combination, the cutting-tool, a nonrotating cylinder, a piston therein, a sleeve fixed to the extremity of the cylinder, a toothed wheel within the sleeve mounted directly and slid ably upon the stem of the tool, a worin engaging the toothed Wheel and supported by the sleeve and means for turning the worm, substantially as described.

5. In pneumatic hammers and other automatic percussive tools, means for effecting the rotation of the cutting-tool, consisting of a motor, a toothed wheel slidably mounted upon the cutting-tool, gear between the motor and the toothed wheel, and a pipe connection between the motor and the exhaust-port of the cylinder, substantially as described.

G. In combination, the cylinder, and piston, a sleeve xed to theeud of the cylinder, a toothed wheel within the sleeve slidably and directly mounted on the stem of the tool, a motor-casing also carried by the sleeve, a vane-wheel therein, a power-s upply pi pe leading to the casing and an operating connection between the vane Wheel and the toothed wheel.

7. In combination, the drill, the cylinder and piston, a power-supplyconduitleadingto the cylinder, a motor for rotating the drill and a connection between the motor and drill, the said motor being operated by the exhaust from the cylinder, substantially as described.

In witness whereof we have hereunto set our hands in presence of two Witnesses.

WILLIAM DAVID JONES. WTILLIAM OWEN PIERCE.

Witnesses:

DANIEL JONES, CHARLES CLARKE. 

